util.subproj/rcmd.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1995, 1996, 1998 Theo de Raadt.  All rights reserved.
  26  * Copyright (c) 1983, 1993, 1994
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  *      This product includes software developed by Theo de Raadt.
  42  * 4. Neither the name of the University nor the names of its contributors
  43  *    may be used to endorse or promote products derived from this software
  44  *    without specific prior written permission.
  45  *
  46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  56  * SUCH DAMAGE.
  57  *
  58  * $FreeBSD: src/lib/libc/net/rcmd.c,v 1.23.2.5 2001/03/05 10:47:11 obrien Exp $
  59  */
  60
  61 #if defined(LIBC_SCCS) && !defined(lint)
  62 static char sccsid[] = "@(#)rcmd.c      8.3 (Berkeley) 3/26/94";
  63 #endif /* LIBC_SCCS and not lint */
  64
  65 #include <sys/param.h>
  66 #include <sys/socket.h>
  67 #include <sys/stat.h>
  68
  69 #include <arpa/inet.h>
  70
  71 #include <signal.h>
  72 #include <fcntl.h>
  73 #include <netdb.h>
  74 #include <unistd.h>
  75 #include <pwd.h>
  76 #include <errno.h>
  77 #include <stdio.h>
  78 #include <ctype.h>
  79 #include <string.h>
  80 #include <time.h>
  81 #ifdef YP
  82 #include <rpc/rpc.h>
  83 #include <rpcsvc/yp_prot.h>
  84 #include <rpcsvc/ypclnt.h>
  85 #endif
  86
  87 #include "nameser8_compat.h"
  88
  89 /* wrapper for KAME-special getnameinfo() */
  90 #ifndef NI_WITHSCOPEID
  91 #define NI_WITHSCOPEID  0
  92 #endif
  93
  94 #ifndef socklen_t
  95 #define socklen_t int
  96 #endif
  97
  98 extern int innetgr __P(( const char *, const char *, const char *, const char * ));
  99 extern int bindresvport_sa(int, struct sockaddr *);
 100
 101 #define max(a, b)       ((a > b) ? a : b)
 102
 103 int     __ivaliduser __P((FILE *, u_int32_t, const char *, const char *));
 104 int __ivaliduser_af __P((FILE *,const void *, const char *, const char *,
 105         int, int));
 106 int __ivaliduser_sa __P((FILE *, const struct sockaddr *, socklen_t,
 107         const char *,const char *));
 108 static int __icheckhost __P((const struct sockaddr *, socklen_t,
 109         const char *));
 110
 111 int
 112 rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
 113         char **ahost;
 114         u_short rport;
 115         const char *locuser, *remuser, *cmd;
 116         int *fd2p;
 117         int af;
 118 {
 119         struct addrinfo hints, *res, *ai;
 120         struct sockaddr_storage from;
 121         fd_set reads;
 122         long oldmask;
 123         pid_t pid;
 124         int s, aport, lport, timo, error;
 125         char c;
 126         int refused, nres;
 127         char num[8], paddr[NI_MAXHOST];
 128         static char canonnamebuf[MAXDNAME];     /* is it proper here? */
 129
 130         pid = getpid();
 131
 132         memset(&hints, 0, sizeof(hints));
 133         hints.ai_flags = AI_CANONNAME;
 134         hints.ai_family = af;
 135         hints.ai_socktype = SOCK_STREAM;
 136         hints.ai_protocol = 0;
 137         (void)snprintf(num, sizeof(num), "%d", ntohs(rport));
 138         error = getaddrinfo(*ahost, num, &hints, &res);
 139         if (error) {
 140                 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 141                         gai_strerror(error));
 142                 if (error == EAI_SYSTEM)
 143                         fprintf(stderr, "rcmd: getaddrinfo: %s\n",
 144                                 strerror(errno));
 145                 return (-1);
 146         }
 147
 148         if (res->ai_canonname
 149          && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) {
 150                 strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf));
 151                 *ahost = canonnamebuf;
 152         }
 153         nres = 0;
 154         for (ai = res; ai; ai = ai->ai_next)
 155                 nres++;
 156         ai = res;
 157         refused = 0;
 158         oldmask = sigblock(sigmask(SIGURG));
 159         for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
 160                 s = rresvport_af(&lport, ai->ai_family);
 161                 if (s < 0) {
 162                         if (errno != EAGAIN && ai->ai_next) {
 163                                 ai = ai->ai_next;
 164                                 continue;
 165                         }
 166                         if (errno == EAGAIN)
 167                                 (void)fprintf(stderr,
 168                                     "rcmd: socket: All ports in use\n");
 169                         else
 170                                 (void)fprintf(stderr, "rcmd: socket: %s\n",
 171                                     strerror(errno));
 172                         freeaddrinfo(res);
 173                         sigsetmask(oldmask);
 174                         return (-1);
 175                 }
 176                 fcntl(s, F_SETOWN, pid);
 177                 if (connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 178                         break;
 179                 (void)close(s);
 180                 if (errno == EADDRINUSE) {
 181                         lport--;
 182                         continue;
 183                 }
 184                 if (errno == ECONNREFUSED)
 185                         refused = 1;
 186                 if (ai->ai_next == NULL && (!refused || timo > 16)) {
 187                         (void)fprintf(stderr, "%s: %s\n",
 188                                       *ahost, strerror(errno));
 189                         freeaddrinfo(res);
 190                         sigsetmask(oldmask);
 191                         return (-1);
 192                 }
 193                 if (nres > 1) {
 194                         int oerrno = errno;
 195
 196                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 197                                     paddr, sizeof(paddr),
 198                                     NULL, 0,
 199                                     NI_NUMERICHOST|NI_WITHSCOPEID);
 200                         (void)fprintf(stderr, "connect to address %s: ",
 201                                       paddr);
 202                         errno = oerrno;
 203                         perror(0);
 204                 }
 205                 if ((ai = ai->ai_next) == NULL) {
 206                         /* refused && timo <= 16 */
 207                         struct timespec time_to_sleep, time_remaining;
 208
 209                         time_to_sleep.tv_sec = timo;
 210                         time_to_sleep.tv_nsec = 0;
 211                         (void)nanosleep(&time_to_sleep, &time_remaining);
 212                         timo *= 2;
 213                         ai = res;
 214                         refused = 0;
 215                 }
 216                 if (nres > 1) {
 217                         getnameinfo(ai->ai_addr, ai->ai_addrlen,
 218                                     paddr, sizeof(paddr),
 219                                     NULL, 0,
 220                                     NI_NUMERICHOST|NI_WITHSCOPEID);
 221                         fprintf(stderr, "Trying %s...\n", paddr);
 222                 }
 223         }
 224 #if 0
 225         /*
 226          * try to rresvport() to the same port. This will make rresvport()
 227          * fail it's first bind, resulting in it choosing a random port.
 228          */
 229         lport--;
 230 #endif
 231         if (fd2p == 0) {
 232                 write(s, "", 1);
 233                 lport = 0;
 234         } else {
 235                 char num[8];
 236                 int s2 = rresvport_af(&lport, ai->ai_family), s3;
 237                 unsigned int len = ai->ai_addrlen;
 238                 int nfds;
 239
 240                 if (s2 < 0)
 241                         goto bad;
 242                 listen(s2, 1);
 243                 (void)snprintf(num, sizeof(num), "%d", lport);
 244                 if (write(s, num, strlen(num)+1) != strlen(num)+1) {
 245                         (void)fprintf(stderr,
 246                             "rcmd: write (setting up stderr): %s\n",
 247                             strerror(errno));
 248                         (void)close(s2);
 249                         goto bad;
 250                 }
 251                 nfds = max(s, s2)+1;
 252                 if(nfds > FD_SETSIZE) {
 253                         fprintf(stderr, "rcmd: too many files\n");
 254                         (void)close(s2);
 255                         goto bad;
 256                 }
 257 again:
 258                 FD_ZERO(&reads);
 259                 FD_SET(s, &reads);
 260                 FD_SET(s2, &reads);
 261                 errno = 0;
 262                 if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
 263                         if (errno != 0)
 264                                 (void)fprintf(stderr,
 265                                     "rcmd: select (setting up stderr): %s\n",
 266                                     strerror(errno));
 267                         else
 268                                 (void)fprintf(stderr,
 269                                 "select: protocol failure in circuit setup\n");
 270                         (void)close(s2);
 271                         goto bad;
 272                 }
 273                 s3 = accept(s2, (struct sockaddr *)&from, &len);
 274                 switch (from.ss_family) {
 275                 case AF_INET:
 276                         aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
 277                         break;
 278 #ifdef INET6
 279                 case AF_INET6:
 280                         aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
 281                         break;
 282 #endif
 283                 default:
 284                         aport = 0;      /* error */
 285                         break;
 286                 }
 287                 /*
 288                  * XXX careful for ftp bounce attacks. If discovered, shut them
 289                  * down and check for the real auxiliary channel to connect.
 290                  */
 291                 if (aport == 20) {
 292                         close(s3);
 293                         goto again;
 294                 }
 295                 (void)close(s2);
 296                 if (s3 < 0) {
 297                         (void)fprintf(stderr,
 298                             "rcmd: accept: %s\n", strerror(errno));
 299                         lport = 0;
 300                         goto bad;
 301                 }
 302                 *fd2p = s3;
 303                 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
 304                         (void)fprintf(stderr,
 305                             "socket: protocol failure in circuit setup.\n");
 306                         goto bad2;
 307                 }
 308         }
 309         (void)write(s, locuser, strlen(locuser)+1);
 310         (void)write(s, remuser, strlen(remuser)+1);
 311         (void)write(s, cmd, strlen(cmd)+1);
 312         if (read(s, &c, 1) != 1) {
 313                 (void)fprintf(stderr,
 314                     "rcmd: %s: %s\n", *ahost, strerror(errno));
 315                 goto bad2;
 316         }
 317         if (c != 0) {
 318                 while (read(s, &c, 1) == 1) {
 319                         (void)write(STDERR_FILENO, &c, 1);
 320                         if (c == '\n')
 321                                 break;
 322                 }
 323                 goto bad2;
 324         }
 325         sigsetmask(oldmask);
 326         freeaddrinfo(res);
 327         return (s);
 328 bad2:
 329         if (lport)
 330                 (void)close(*fd2p);
 331 bad:
 332         (void)close(s);
 333         sigsetmask(oldmask);
 334         freeaddrinfo(res);
 335         return (-1);
 336 }
 337
 338 int
 339 rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
 340         char **ahost;
 341         in_port_t rport;
 342         const char *locuser, *remuser, *cmd;
 343         int *fd2p;
 344 {
 345         return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
 346 }
 347
 348 int
 349 rresvport(port)
 350         int *port;
 351 {
 352         return rresvport_af(port, AF_INET);
 353 }
 354
 355 int
 356 rresvport_af(alport, family)
 357         int *alport, family;
 358 {
 359         int s;
 360         struct sockaddr_storage ss;
 361         u_short *sport;
 362
 363         memset(&ss, 0, sizeof(ss));
 364         ss.ss_family = family;
 365         switch (family) {
 366         case AF_INET:
 367                 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
 368                 sport = &((struct sockaddr_in *)&ss)->sin_port;
 369                 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
 370                 break;
 371 #ifdef INET6
 372         case AF_INET6:
 373                 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
 374                 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
 375                 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
 376                 break;
 377 #endif
 378         default:
 379                 errno = EAFNOSUPPORT;
 380                 return -1;
 381         }
 382
 383         s = socket(ss.ss_family, SOCK_STREAM, 0);
 384         if (s < 0)
 385                 return (-1);
 386 #if 0 /* compat_exact_traditional_rresvport_semantics */
 387         sin.sin_port = htons((u_short)*alport);
 388         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
 389                 return (s);
 390         if (errno != EADDRINUSE) {
 391                 (void)close(s);
 392                 return (-1);
 393         }
 394 #endif
 395         *sport = 0;
 396         if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
 397                 (void)close(s);
 398                 return (-1);
 399         }
 400         *alport = (int)ntohs(*sport);
 401         return (s);
 402 }
 403
 404 int     __check_rhosts_file = 1;
 405 char    *__rcmd_errstr;
 406
 407 /*  Guess at the size of a password buffer for getpwnam_r (see lookup.subproj/lu_group.c) */
 408 #define MAXPWBUF (MAXLOGNAME + 1 + _PASSWORD_LEN + 1 + MAXPATHLEN + 1 + MAXPATHLEN + 1 + 4098)
 409
 410 /*
 411  * AF independent extension of iruserok.
 412  *
 413  * Returns 0 if ok, -1 if not ok.
 414  */
 415 int
 416 iruserok_sa(ra, rlen, superuser, ruser, luser)
 417         const void *ra;
 418         int rlen;
 419         int superuser;
 420         const char *ruser, *luser;
 421 {
 422         register char *cp;
 423         struct stat sbuf;
 424         struct passwd p, *pwd;
 425         FILE *hostf;
 426         uid_t uid;
 427         int first, status;
 428         char pbuf[MAXPATHLEN];
 429         const struct sockaddr *raddr;
 430         struct sockaddr_storage ss;
 431         char pwbuf[MAXPWBUF];
 432
 433         /* avoid alignment issue */
 434         if (rlen > sizeof(ss))
 435                 return(-1);
 436         memcpy(&ss, ra, rlen);
 437         raddr = (struct sockaddr *)&ss;
 438
 439         first = 1;
 440         hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
 441 again:
 442         if (hostf) {
 443                 if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) {
 444                         (void)fclose(hostf);
 445                         return (0);
 446                 }
 447                 (void)fclose(hostf);
 448         }
 449         if (first == 1 && (__check_rhosts_file || superuser)) {
 450                 first = 0;
 451
 452                 memset(&p, 0, sizeof(struct passwd));
 453                 memset(pwbuf, 0, sizeof(pwbuf));
 454                 pwd = NULL;
 455
 456                 status = getpwnam_r(luser, &p, pwbuf, MAXPWBUF, &pwd);
 457                 if (status != 0) return -1;
 458
 459                 (void)strcpy(pbuf, pwd->pw_dir);
 460                 (void)strcat(pbuf, "/.rhosts");
 461
 462                 /*
 463                  * Change effective uid while opening .rhosts.  If root and
 464                  * reading an NFS mounted file system, can't read files that
 465                  * are protected read/write owner only.
 466                  */
 467                 uid = geteuid();
 468                 (void)seteuid(pwd->pw_uid);
 469                 hostf = fopen(pbuf, "r");
 470                 (void)seteuid(uid);
 471
 472                 if (hostf == NULL)
 473                         return (-1);
 474                 /*
 475                  * If not a regular file, or is owned by someone other than
 476                  * user or root or if writeable by anyone but the owner, quit.
 477                  */
 478                 cp = NULL;
 479                 if (lstat(pbuf, &sbuf) < 0)
 480                         cp = ".rhosts lstat failed";
 481                 else if (!S_ISREG(sbuf.st_mode))
 482                         cp = ".rhosts not regular file";
 483                 else if (fstat(fileno(hostf), &sbuf) < 0)
 484                         cp = ".rhosts fstat failed";
 485                 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
 486                         cp = "bad .rhosts owner";
 487                 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
 488                         cp = ".rhosts writeable by other than owner";
 489                 /* If there were any problems, quit. */
 490                 if (cp) {
 491                         __rcmd_errstr = cp;
 492                         (void)fclose(hostf);
 493                         return (-1);
 494                 }
 495                 goto again;
 496         }
 497         return (-1);
 498 }
 499
 500 int
 501 ruserok(rhost, superuser, ruser, luser)
 502         const char *rhost, *ruser, *luser;
 503         int superuser;
 504 {
 505         struct addrinfo hints, *res, *r;
 506         int error;
 507
 508         memset(&hints, 0, sizeof(hints));
 509         hints.ai_family = PF_UNSPEC;
 510         hints.ai_socktype = SOCK_DGRAM; /*dummy*/
 511         error = getaddrinfo(rhost, "0", &hints, &res);
 512         if (error)
 513                 return (-1);
 514
 515         for (r = res; r; r = r->ai_next) {
 516                 if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser,
 517                     luser) == 0) {
 518                         freeaddrinfo(res);
 519                         return (0);
 520                 }
 521         }
 522         freeaddrinfo(res);
 523         return (-1);
 524 }
 525
 526 /*
 527  * New .rhosts strategy: We are passed an ip address. We spin through
 528  * hosts.equiv and .rhosts looking for a match. When the .rhosts only
 529  * has ip addresses, we don't have to trust a nameserver.  When it
 530  * contains hostnames, we spin through the list of addresses the nameserver
 531  * gives us and look for a match.
 532  *
 533  * Returns 0 if ok, -1 if not ok.
 534  */
 535 int
 536 iruserok(raddr, superuser, ruser, luser)
 537         unsigned long raddr;
 538         int superuser;
 539         const char *ruser, *luser;
 540 {
 541         struct sockaddr_in sin;
 542
 543         memset(&sin, 0, sizeof(sin));
 544         sin.sin_family = AF_INET;
 545         sin.sin_len = sizeof(struct sockaddr_in);
 546         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 547         return iruserok_sa((struct sockaddr *)&sin, sin.sin_len, superuser,
 548                 ruser, luser);
 549 }
 550
 551 /*
 552  * XXX
 553  * Don't make static, used by lpd(8).
 554  *
 555  * Returns 0 if ok, -1 if not ok.
 556  */
 557 int
 558 __ivaliduser(hostf, raddr, luser, ruser)
 559         FILE *hostf;
 560         u_int32_t raddr;
 561         const char *luser, *ruser;
 562 {
 563         struct sockaddr_in sin;
 564
 565         memset(&sin, 0, sizeof(sin));
 566         sin.sin_family = AF_INET;
 567         sin.sin_len = sizeof(struct sockaddr_in);
 568         memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr));
 569         return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin.sin_len,
 570                 luser, ruser);
 571 }
 572
 573 /*
 574  * Returns 0 if ok, -1 if not ok.
 575  *
 576  * XXX obsolete API.
 577  */
 578 int
 579 __ivaliduser_af(hostf, raddr, luser, ruser, af, len)
 580         FILE *hostf;
 581         const void *raddr;
 582         const char *luser, *ruser;
 583         int af, len;
 584 {
 585         struct sockaddr *sa = NULL;
 586         struct sockaddr_in *sin = NULL;
 587 #ifdef INET6
 588         struct sockaddr_in6 *sin6 = NULL;
 589 #endif
 590         struct sockaddr_storage ss;
 591
 592         memset(&ss, 0, sizeof(ss));
 593         switch (af) {
 594         case AF_INET:
 595                 if (len != sizeof(sin->sin_addr))
 596                         return -1;
 597                 sin = (struct sockaddr_in *)&ss;
 598                 sin->sin_family = AF_INET;
 599                 sin->sin_len = sizeof(struct sockaddr_in);
 600                 memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr));
 601                 break;
 602 #ifdef INET6
 603         case AF_INET6:
 604                 if (len != sizeof(sin6->sin6_addr))
 605                         return -1;
 606                 /* you will lose scope info */
 607                 sin6 = (struct sockaddr_in6 *)&ss;
 608                 sin6->sin6_family = AF_INET6;
 609                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 610                 memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr));
 611                 break;
 612 #endif
 613         default:
 614                 return -1;
 615         }
 616
 617         sa = (struct sockaddr *)&ss;
 618         return __ivaliduser_sa(hostf, sa, sa->sa_len, luser, ruser);
 619 }
 620
 621 /*
 622  * Returns 0 if ok, -1 if not ok.
 623  */
 624 int
 625 __ivaliduser_sa(hostf, raddr, salen, luser, ruser)
 626         FILE *hostf;
 627         const struct sockaddr *raddr;
 628         socklen_t salen;
 629         const char *luser, *ruser;
 630 {
 631         register char *user, *p;
 632         int ch;
 633         char buf[MAXHOSTNAMELEN + 128];         /* host + login */
 634         char hname[MAXHOSTNAMELEN];
 635         /* Presumed guilty until proven innocent. */
 636         int userok = 0, hostok = 0;
 637 #ifdef YP
 638         char *ypdomain;
 639
 640         if (yp_get_default_domain(&ypdomain))
 641                 ypdomain = NULL;
 642 #else
 643 #define ypdomain NULL
 644 #endif
 645         /*
 646          * We try to get the hostname back for netgroup matching.
 647          * However, the .rosts file may contain IP addresses as well
 648          * as names, so a name is not always required.
 649          */
 650         getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, NI_NAMEREQD);
 651
 652         while (fgets(buf, sizeof(buf), hostf)) {
 653                 p = buf;
 654                 /* Skip lines that are too long. */
 655                 if (strchr(p, '\n') == NULL) {
 656                         while ((ch = getc(hostf)) != '\n' && ch != EOF);
 657                         continue;
 658                 }
 659                 if (*p == '\n' || *p == '#') {
 660                         /* comment... */
 661                         continue;
 662                 }
 663                 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
 664                         *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
 665                         p++;
 666                 }
 667                 if (*p == ' ' || *p == '\t') {
 668                         *p++ = '\0';
 669                         while (*p == ' ' || *p == '\t')
 670                                 p++;
 671                         user = p;
 672                         while (*p != '\n' && *p != ' ' &&
 673                             *p != '\t' && *p != '\0')
 674                                 p++;
 675                 } else
 676                         user = p;
 677                 *p = '\0';
 678                 /*
 679                  * Do +/- and +@/-@ checking. This looks really nasty,
 680                  * but it matches SunOS's behavior so far as I can tell.
 681                  */
 682                 switch(buf[0]) {
 683                 case '+':
 684                         if (!buf[1]) {     /* '+' matches all hosts */
 685                                 hostok = 1;
 686                                 break;
 687                         }
 688                         if (buf[1] == '@')  /* match a host by netgroup */
 689                                 hostok = innetgr((char *)&buf[2],
 690                                         (char *)&hname, NULL, ypdomain);
 691                         else            /* match a host by addr */
 692                                 hostok = __icheckhost(raddr, salen,
 693                                                       (char *)&buf[1]);
 694                         break;
 695                 case '-':     /* reject '-' hosts and all their users */
 696                         if (buf[1] == '@') {
 697                                 if (innetgr((char *)&buf[2],
 698                                               (char *)&hname, NULL, ypdomain))
 699                                         return(-1);
 700                         } else {
 701                                 if (__icheckhost(raddr, salen,
 702                                                  (char *)&buf[1]))
 703                                         return(-1);
 704                         }
 705                         break;
 706                 default:  /* if no '+' or '-', do a simple match */
 707                         hostok = __icheckhost(raddr, salen, buf);
 708                         break;
 709                 }
 710                 switch(*user) {
 711                 case '+':
 712                         if (!*(user+1)) {      /* '+' matches all users */
 713                                 userok = 1;
 714                                 break;
 715                         }
 716                         if (*(user+1) == '@')  /* match a user by netgroup */
 717                                 userok = innetgr(user+2, NULL, ruser, ypdomain);
 718                         else       /* match a user by direct specification */
 719                                 userok = !(strcmp(ruser, user+1));
 720                         break;
 721                 case '-':               /* if we matched a hostname, */
 722                         if (hostok) {   /* check for user field rejections */
 723                                 if (!*(user+1))
 724                                         return(-1);
 725                                 if (*(user+1) == '@') {
 726                                         if (innetgr(user+2, NULL,
 727                                                         ruser, ypdomain))
 728                                                 return(-1);
 729                                 } else {
 730                                         if (!strcmp(ruser, user+1))
 731                                                 return(-1);
 732                                 }
 733                         }
 734                         break;
 735                 default:        /* no rejections: try to match the user */
 736                         if (hostok)
 737                                 userok = !(strcmp(ruser,*user ? user : luser));
 738                         break;
 739                 }
 740                 if (hostok && userok)
 741                         return(0);
 742         }
 743         return (-1);
 744 }
 745
 746 /*
 747  * Returns "true" if match, 0 if no match.
 748  *
 749  * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion
 750  * if af == AF_INET6.
 751  */
 752 static int
 753 __icheckhost(raddr, salen, lhost)
 754         const struct sockaddr *raddr;
 755         socklen_t salen;
 756         const char *lhost;
 757 {
 758         struct sockaddr_in sin;
 759         struct sockaddr_in6 *sin6;
 760         struct addrinfo hints, *res, *r;
 761         int error;
 762         char h1[NI_MAXHOST], h2[NI_MAXHOST];
 763
 764         if (raddr->sa_family == AF_INET6) {
 765                 sin6 = (struct sockaddr_in6 *)raddr;
 766                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 767                         memset(&sin, 0, sizeof(sin));
 768                         sin.sin_family = AF_INET;
 769                         sin.sin_len = sizeof(struct sockaddr_in);
 770                         memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
 771                                sizeof(sin.sin_addr));
 772                         raddr = (struct sockaddr *)&sin;
 773                         salen = sin.sin_len;
 774                 }
 775         }
 776
 777         h1[0] = '\0';
 778         if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0,
 779                         NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 780                 return (0);
 781
 782         /* Resolve laddr into sockaddr */
 783         memset(&hints, 0, sizeof(hints));
 784         hints.ai_family = raddr->sa_family;
 785         hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/
 786         res = NULL;
 787         error = getaddrinfo(lhost, "0", &hints, &res);
 788         if (error)
 789                 return (0);
 790
 791         for (r = res; r ; r = r->ai_next) {
 792                 h2[0] = '\0';
 793                 if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2),
 794                                 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
 795                         continue;
 796                 if (strcmp(h1, h2) == 0) {
 797                         freeaddrinfo(res);
 798                         return (1);
 799                 }
 800         }
 801
 802         /* No match. */
 803         freeaddrinfo(res);
 804         return (0);
 805 }